diff --git a/Project.toml b/Project.toml
index 035bb0f..5a3030f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,7 +20,7 @@ DataStructures = "0.19"
 DiffEqBase = "7"
 FunctionWrappers = "1.1.3"
 LinearAlgebra = "1"
-ModelingToolkit = "9, 10, 11"
+ModelingToolkit = "9, 10, 11.21"
 NonlinearSolve = "3, 4"
 ODEInterface = "0.5.2"
 ODEProblemLibrary = "1"